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Stdin

For CLI tools, it’s often useful to read from stdin. In JSTime, the console object is an AsyncIterable that yields lines from stdin.

const prompt = "Type something: ";
process.stdout.write(prompt);
for await (const line of console) {
  console.log(`You typed: ${line}`);
  process.stdout.write(prompt);
}

Running this file results in a never-ending interactive prompt that echoes whatever the user types.

Terminal window
$ jstime run index.tsx
Type something: hello
You typed: hello
Type something: hello again
You typed: hello again

JSTime also exposes stdin as a BunFile via JSTime.stdin. This is useful for incrementally reading large inputs that are piped into the jstime process.

There is no guarantee that the chunks will be split line-by-line.

for await (const chunk of JSTime.stdin.stream()) {
  // chunk is Uint8Array
  // this converts it to text (assumes ASCII encoding)
  const chunkText = Buffer.from(chunk).toString();
  console.log(`Chunk: ${chunkText}`);
}

This will print the input that is piped into the jstime process.

Terminal window
$ echo "hello" | jstime run stdin.ts
Chunk: hello

See Docs > API > Utils for more useful utilities.